Steering device for vehicle

Abstract

The steering device for vehicle changes the steering angle by transmitting the movements of the steering electrical actuator to the vehicle wheels. When the vehicle is steered in the stationary state, the hydraulic fluid can be supplied to the steering assistance force generating hydraulic actuator from the pump within the hydraulic pressure imparting unit. When the vehicle is not steered in the stationary state, the hydraulic fluid can be supplied to the brake device from the pump via the hydraulic pressure distribution unit.

What is claimed is:  
     
       1. A steering device for a vehicle having vehicle wheels, comprising: 
       a steering electrical actuator;  
       means for transmitting movement of the steering electrical actuator to the vehicle wheels such that steering angle changes according to the movement;  
       a pump to supply hydraulic fluid;  
       a brake device;  
       a steering assistance force generation hydraulic actuator;  
       means for judging whether the vehicle is steered in a stationary state and producing a judgment result; and  
       means for switching a supply route of the hydraulic fluid in response to the judgment result such that, the hydraulic fluid is supplied to the steering assistance force generation hydraulic actuator from the pump when the vehicle is steered in the stationary state, and the hydraulic fluid is supplied to the brake device from the pump when the vehicle is not steered in the stationary state.  
     
     
       2. The steering device for vehicle according to  claim 1 , wherein the movement of the steering electrical actuator is transmitted to the vehicle wheels without mechanical linkage of an operating member, for manual operation by a user to effect steering, with the vehicle wheels. 
     
     
       3. The steering device for vehicle according to  claim 1 , wherein the means for transmitting of the movement of the steering electrical actuator to the vehicle wheels is comprised of a steering gear, the means for switching the supply route of the hydraulic fluid is comprised of an electromagnetic switching valve, and the means for judging whether the vehicle is steered in the stationary state is comprised of a computer.